/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Adds a macro graph to this blueprint. If bIsUserCreated is true, the entry/exit nodes will be editable. SignatureFromClass is used to find signature for entry/exit nodes if using an existing signature.
static void AddMacroGraph ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, class [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) * Graph, bool bIsUserCreated, [UClass](API\Runtime\CoreUObject\UObject\UClass) * SignatureFromClass )